2005 International 9900ix ac problems

Discussion in 'International Forum' started by springtown76, Apr 27, 2019.

  1. springtown76

    springtown76 Bobtail Member

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    Looking for some ideas on the ac system on a 2005 International 9900ix with a ISX 15 L Cummins. Here’s a run down of new parts and what we’ve done so far.
    a/c condenser
    ALL a/c hoses are new
    Receiver dryer
    High pressure sensor up by the compressor
    Expansion valve is new
    Evaporator core is new.

    After all of this was installed we completely vacuumed the system down. Went to start filling the system with freon and the a/c compressor clutch won’t engage. No power to the compressor. The breaker in the glove box is good, as are the 2 relays in the glove box for the a/c system. The light comes on in the dash when the a/c button is pushed. The only things that haven’t been replaced are the pressure sensors on the expansion valve, and the compressor itself. What am I missing with no power to the compressor? Any and all help would be appreciated, thanks in advance!
     
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  3. stuckinthemud

    stuckinthemud Medium Load Member

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  4. Heavyd

    Heavyd Road Train Member

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    There are two electrical systems for the AC on your truck. It will have one or the other depending on how it was ordered. One uses a little electronic module to control the ac. This is called an APADS module and it is mounted on the firewall usually on the coolant tank bracket on the left hand side. It will have a green and red LED on it and may be blinking a fault code. If you have this, and it trips, you need to reset it by making 4 key on/key off cycles in a row. If it does not have the module, then the wiring is slightly different and the next spot to check for power is at the freeze switch under the passenger seat.
     
    springtown76 Thanks this.
  5. springtown76

    springtown76 Bobtail Member

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    I believe this one must not have an apads system. I checked both sides of the firewall and did not find a module. On the left (drivers side) was the normal wiring harness going into the firewall along with some air lines. On the passenger side (right side) was more of the same, more wire harness’s going into the firewall. I will try and get some pictures monday to post just to make sure I’m not missing something. In the meantime, I did some checking with the test light. I pulled the relays again and found the relay on the bottom of the fuse panel labeled for the ac did not have any juice on any of the terminals. The relay on the left side of the fuse panel had power on 1 of the terminals. Not having a wire diagram to go by, I figured I would pull out the control panel and test on the backside of that. I probed every wire to do process of elimniation, and found power in, but Could not find a wire that gained or lost power when the ac switch was turned on and off. So knowing this, is it common for that control board to go bad? I assume power into the board, then power would go back out to one of the relays?? Or should I still be checking the freeze switch under the seat first? Thanks again for your help!!
     
  6. Heavyd

    Heavyd Road Train Member

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  7. springtown76

    springtown76 Bobtail Member

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    Thank you very much for the link. Turns out the main control board (where the A/C button is to turn on the system) was faulty. There was power going into the board, but when a guy pressed the A/C button it wouldn't send power back out. Figuring out which wire ran from there to the relay was probabaly the trickiest part, but after enough probing with the multi-meter I was able to figure it out. Now after that, thanks for the jumping the freeze switch wires, because after I restored power to the relay, still nothing to the compressor until I jumped those wires, after i jumped them, boom, power to the compressor. Again, thank you, your knowledge and guidance has been great!! Now off to find a freeze switcch.
     
    Heavyd Thanks this.
  8. Chady3833

    Chady3833 Bobtail Member

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    Sep 25, 2021
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  9. Chady3833

    Chady3833 Bobtail Member

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    I have a 2003 9900 and the low pressure switch has power to both sides? Any idea?
     
  10. Heavyd

    Heavyd Road Train Member

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    You probably have the system with the APADS module. How exactly are you measuring for voltage?
     
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